Window lock



May 22, 1934. M. L. STEWART WINDOW LOCK Filed Sept. 8, 1931 In in will)? N '2 8% 5% V M M W 0 5 Patented May 22, 1934 UNITED STATES PATENT OFFICE 1 Claim.

My invention relates to improvements in antiburglary devices for homes and buildings, and provides a device of this character which is composed of a small compact article that may be quickly and easily attached to the top surface of the frame of the lower sash preferably with wood screws, and being arranged in construction so that a pair of oppositely disposed jaws will automatically wedge against the upper sash and the window frame and cause the lower sash to be firmly locked in such a manner as to make it impossible to raise, and the upper sash will be likewise wedged or locked, and prevented from being pulled downward. A pair of handle portions is arranged so that by closing them slightly with the fingers the device is instantly released, thus releasing both the upper and lower sash and leaving them free to operate as in ordinary use.

In this day and time burglarizing homes and other buildings by which entrance is almost invariably made through windows, a window lock that is unseen from the outside of the house is such an urgent requirement that I consider my device as an important advancement toward the safety of life and property in general, and inasmuch as the construction of same is so extremely simple, and the manufacturing cost so low, consequently the selling price of my article would be well within the reach of all classes, hence the advantage of the invention viewing it from a commercial valuation.

Ihe invention possesses further advantages, all of which will be clearly revealed during the course of the following detailed description, illustrated throughout the accompanying drawing, and more fully pointed out in the appended claim.

With direct reference to the drawing:

Figure 1 is a View of my complete device, showing the same attached to a window and in the act of causing both the upper and lower sash thereof to be firmly locked.

Figure 2 is a view of the device indicating the jaws having been released, leaving both sash free to normally operate.

Figure 3 is a top plan View of the complete device.

Figure 4 is a perspective View of the principal member; Figures 5 and 6 respectively are similar views of the jaws of the device.

The invention comprises a principal member having base 1 which forms at right angles thereto back 2. Levers 3 and 4 are provided and are pivotally secured to back 2 by means of rivets 5 and 6 respectively, and as clearly seen in Figure 3. Lever 3 has jaw portion '7 formed thereon, while lever 4 has similar jaw portion 8 formed upon the same. With particular reference to Figure 1 it is observed that jaws 7 and 8 are adapted to contact upper sash A and the line B of the window frame, respectively, and as levers 3 and 4 are free to pivot on rivets 5 and 6 respectively, and base 1 of the principal member being held firmly to lower sash C by screws 9, it is clearly understood that an attempt to raise sash C or to lower sash A, jaws '7 and 8 would become more intensely wedged in this position proportionately to the amount of energy exerted upon the sash in the attempt.

A simple and novel means is provided whereby jaws 7 and 8 may be quickly released, and this consists of handle portion 10 formed as a part of lever 3, and likewise handle portion 11' being formed upon lever 4, and with reference to Figure 2 it will be seen that these handle portions are moved to the position as indicated in this View, and will remain in this position due to the fact that portion 10 is twisted as shown, also portion 11 is similarly twisted and slightly leaning toward portion 10, and by referring to Figure 3 it is consistently clear that by virtue of handle portion 11 leaning toward handle portion 10 they will have become interlocked as in Figure 2. Countersunk holes 12 in base 1 are for passage of screws 9, while holes 13 in levers 3 and 4 respectively are for rivets 5 and 6, also holes 14 in back 2 for respective rivets 5 and 6.

While I have hereinabove, with the aid of the accompanying drawing, described one precise embodiment of my invention, certain minor changes might be made in the formation of its parts, in the event that this would become a necessity during any probable further development of the same for the market; however in any eventuality, a departure from the general principle as described and claimed would be consistently avoided.

Having thus described my invention, what I claim as new is:

In a window lock of the class described, a frame member for the same, the said member consisting of a horizontally arranged base, the said base being the means whereby the complete device is secured to the top portion of the inner sash of a building, a mechanism supporting means which is vertically formed from the aforesaid base, looking means comprising a lever adapted to be pivotally secured to one side of the aforesaid mechanism supporting means, an additional lever adapted to be pivotally secured to the opposite side of the last-named means, means provided upon each of said levers for engaging portions of said frame member and the outer sash, and. normally urged to operative positions to provide a-wedging engagement whereby the movement of either sash to an opened position will be prevented by said wedging engagement.

MARTIN L. STEWART. 

